Explanatory notes
… used as pigments. They include : (1) Ochres (yellow, brown, red, Spanish red, etc.). (2) Siennas (Italian … (D) MINERAL SUBSTANCES NOT ELSEWHERE SPECIFIED OR INCLUDED; BROKEN POTTERY This group covers, inter alia : (1) … are : (i) Realgar, which is an arsenic disulphide, bright red in colour, used in pyrotechnics. (ii) Orpiment, …